Bip39 generator https://ameblo.jp/generate-bip39brooks/entry-12913353546.html Though it uses BIP32 strategy you may still import BIP39 seeds into Electrum wallet. Also other than BIp32 There exists BIP44 Variation which some wallet use to the generation of seeds. BitBox02 - A successor to your BitBox sequence, this hardware wallet supports BIP39 seed phrases and https://social4geek.com/story6341806/bip-39-index-indicators-on-bip39-standard-you-should-know-https-linktr-ee-bip39